Java. Sax parser. How to manually break parsing? [

问题:

This question already has an answer here:

• How to stop parsing xml document with SAX at any time? 3 answers

Tell me please is it possible to break the process of parsing? I.e. exit this loop not reaching the end of document and corresponding event "endDocument" ?

回答1:

Throw an exception in the handler and catch it in the code block where you started parsing:

try {
    ...
    xmlReader.parse();
} catch (SAXException e) {
    if (e.Cause instanceof BreakParsingException) {
        // we have broken the parsing process
        ....
    }
}

And in your DocumentHandler:

public void startElement(String namespaceURI,
                     String localName,
                     String qName,
                     Attributes atts)
              throws SAXException {
    // ...
    throw new SAXException(new BreakParsingException());
}

回答2:

Simple solution would be to use StAX parsing - instead of SAX. While SAX has push parsing - events are sent to the Handler by the Parsers, StAX is pull parsing, events are given to us through XMLEventReader which can be used similar to an iterator. So, it is easier to implement conditional break to break out of the parsing.

回答3:

You have to throw a SAXException. In order to distiguish it from regular errors I would subclass it with my own Exception class